Computing A

1 . A method comprising:

selecting a transmitter to a casing offset for logging operations based at least in part on a logging fluid within the casing, wherein the transmitter is a collimated transducer that is disposed on a logging tool;

insonifying at least a part of a casing with the transmitter at an angle of incidence;

collecting one or more waveforms with an array of receivers disposed on the logging tool;

identifying one or more wave mode travel times from the one or more waveforms;

selecting one or more wavelets from the one or more waveforms;

identifying an attenuation of a lamb wave mode based at least in part on the one or more wave mode travel times and the one or more wavelets;

wherein the angle of incidence is selected based on the insonifying frequency; and

wherein the insonifying frequency is chosen from a dispersion curve for the lamb wave mode.

2 . The method of claim 1 , wherein the casing offset is selected based at least in part on an attenuation of the logging fluid within a casing.

3 . The method of claim 2 , wherein the frequency is chosen from a dispersion curve for the lamb wave mode.

4 . The method of claim 1 , wherein the attenuation of the lamb wave mode is at least partially identified from a gradient of a best fit line.

5 . The method of claim 4 , wherein the best fit line is found using at least squares.

6 . The method of claim 1 , wherein the waveform is generated from a drive pulse.

7 . The method of claim 6 , wherein the drive pulse is chosen based at least in part on producing an identified wave mode.

8 . The method of claim 7 , wherein the identified wave mode is a flexural mode.

9 . The method of claim 1 , wherein the array of receivers is at least three receivers.

10 . A system comprising:

a logging tool comprising:

a transmitter for insonifying at least a part of a casing at an angle of incidence, wherein the transmitter is a collimated transducer; and

an array of receivers for collecting one or more waveforms; and

an information handling system configured to:

determine a transmitter to a casing offset based on sensor data, input data, or both;

identify one or more wave mode travel times from the one or more waveforms;

select one or more wavelets from the one or more waveforms;

identify an attenuation of a lamb wave mode based at least in part on the one or more wave mode travel times and the one or more wavelets;

wherein the angle of incidence is selected based on the insonifying frequency; and

wherein the insonifying frequency is chosen from a dispersion curve for the lamb wave made.

11 . The system of claim 10 , wherein the setinput data comprises a user selection is chosen based at least in part on a logging fluid within a casing.

12 . The system of claim 11 , wherein the frequency is chosen from a dispersion curve for the lamb wave mode.

13 . The system of claim 10 , wherein the attenuation of the lamb wave mode is at least partially identified from a gradient of a best fit line.

14 . The system of claim 13 , wherein the best fit line is found using at least squares.

15 . The system of claim 10 , wherein the waveform is generated from a drive pulse.

16 . The system of claim 15 , wherein the drive pulse is chosen based at least in part on producing an identified wave mode.

17 . The system of claim 16 , wherein the identified wave mode is a flexural mode.

18 . The system of claim 10 , wherein the array of receivers is at least three receivers.